KR20070095348A - Partially lined disk brake - Google Patents

Abstract

The invention relates to a partially lined disk brake (1) comprising a housing (2) and a housing bridge (3) with at least one housing leg (6) that is provided with an actuation unit (4, 5), said actuation unit (4, 5) encompassing an actuator unit (5) and a component (4) which can be moved along an axis of movement (13). At least one brake shoe (21) which is disposed on the component (4) and is movably mounted on at least one support (27, 28) is also provided. Said brake shoe (21) is braced with the support (27, 28) against a contact area (15, 16) by means of a retaining spring (14). One aim of the invention is to create a partially lined brake disk which comprises a retaining spring and is provided with an improved lifting behavior of the brake shoes. Said aim is achieved by disposing the contact area (15, 16) of the retaining spring (14) antiparallel to the axis of movement (13), thus generating a radial biasing force FR as well as another force component F X which runs perpendicular thereto and supports the retracting movement of the brake shoe (21) from the brake disk, thus improving the lifting behavior.

Description

Partial Lining Disc Brake {PARTIALLY LINED DISK BRAKE}

The present invention relates to a spot type disc brake, in particular a vehicle bridge type disc brake having a housing bridge, a first housing leg having an operating unit, and a housing comprising an outer second housing leg. In this configuration, each brake shoe comprising a brake lining and a back plate acting on the brake disc is fixed to the inner side of the housing leg. The housing and the brake shoe are slidably mounted to the mounting support of the vehicle in the direction of the movement axis of the operating unit. In addition, a hold-down spring is provided on the side of the operating unit between the contact surface of the housing bridge and the brake shoe, and in order to prevent the brake shoe from rattling on the mounting support, the spring is fitted with a brake shoe. Preload to the support and contact surface.

DE 25 58 141 A1 discloses a similar spot type disc brake comprising a piston-and-cylinder unit as the actuating unit. When the brake is actuated, the piston moves out of the cylinder and pushes the piston side brake shoe onto the brake disk until the piston side brake shoe contacts the brake disk. At this time, the piston-and-cylinder unit and the piston side housing leg are respectively away from the brake disc and pull the opposite housing leg in the disc side direction. As a result, the other brake shoe is pressed against the brake disc, and the two brake shoes exert a vertical force on the brake disc. When the brake is released, the hydraulic pressure is not supplied to the piston-and-cylinder unit, and the brake shoes no longer apply vertical force on the brake disc. However, the brake shoes still lean against the brake discs, creating a residual brake torque, so-called residual moment, due to friction. In addition, the pads are thermally heavily loaded since no more air flow occurs between the pads and the disks and the pads and the disks are not thermally separated.

In view of the foregoing, it is an object of the present invention to disclose a spot type disc brake comprising a hold down spring with improved clearance behavior of the brake shoe, which means that the residual moment is reduced and the pad and disc are thermally separated. do.

According to the invention, this object is achieved by arranging the contact surface of the holddown spring of the housing bridge not parallel to the movement axis, along which the movable element of the operating unit moves. Thus, not only the radial preloading force that presses the brake shoe to the mounting support is generated, but also a force component perpendicular to the brake shoe. This fact helps to retract the brake shoe, move the moving element of the operating unit away from the brake disc, and improve the clearance behavior because there is a small air slot between the brake shoe and the brake disc.

In a preferred embodiment of the invention, an angle α greater than 0 ° is provided between the contact surface and the movement axis, which angle α is formed by the force vector of the movement axis and the resulting spring force F _F. To lie in the plane. Thus, the spring generates not only the radial preload force F _R but also the axial force component F _X parallel to the axis of movement, which axial force component causes the piston and the piston side brake shoe to its initial position. To improve the clearance operation.

The force component F _X parallel to the axis of movement acts particularly effectively with respect to the gap behavior when the angle α is greater than approximately 1.5 °.

In a particularly preferred embodiment of the invention, the angle α is limited to approximately 1.5 ° to 11 °. When the angle α exceeds 11 °, the radial preload force F _R of the brake shoe is advantageously reduced for the force component F _X parallel to the moving axis in the range in which undesirable operating performance is not caused. something to do.

Due to the material combination of the holddown spring and the housing bridge, and due to application in atmospheric conditions, the contact area between the holddown spring and the contact surface is exposed to large erosion. Therefore, it is particularly desirable to provide one or more small spot-shaped contact areas between the hold down spring and the contact surface of the housing bridge in order to minimize erosion factors and reduce erosion.

In order to manufacture the disc brake at low cost, the contact surface and the housing bridge are integrally constructed. Since the contact face and the housing bridge are made in one casting operation, no additional manufacturing costs are incurred.

In another preferred embodiment of the invention, the contact surface and the housing bridge consist of a plurality of parts. Therefore, when a suitable material is selected and a particularly hard and / or erosion resistant material is used, the abrasion and / or erosion of the contact surface and the spring will be slowed down.

In addition, since the wire or leaf spring can be manufactured in large quantities under desirable conditions due to its simple configuration, there is an advantage in manufacturing cost when using the wire or leaf spring as a holddown spring.

Another advantage of the invention is evident, in particular when using hydraulic or electromechanical actuating units. Since only one effective direction of movement is mainly possible in the hydraulic actuating unit, there is no hydraulic retracting force on the piston and brake shoe, and consequently, the axial infeed component of the spring force F _F. (F _X ) is very important for the brake function. The force component F _X is particularly necessary in the case of electromechanical actuation, in which case the operating unit has failed and the brake shoe can no longer be pulled out.

The present invention will be described in more detail with reference to the drawings.

1 is a cross-sectional view of the spot type disc brake of the first embodiment of the present invention taken along line II-II.

2 is another view of the embodiment taken along the intersection line I-I.

3 is a perspective view of a spot type disc brake according to another embodiment in which the contact surface consists of an extension.

<Explanation of symbols for main parts of the drawings>

1 Spot type disc brake 2 Housing

3 housing bridge 4 piston

5 cylinder 6 inner first housing leg

7 Outer second housing leg 8 Brake plate

9 brake lining 10 back plate

11 Brake lining 12 Mounting support

13 moving axis 14 holddown spring

15 contact face 16 contact face

17 Spot Contact Area 18 Extension

19 extension 20 pin

21 Brake Shoe 22 Brake Shoe

23 screw 24 screw

25 pin 26 spring

27 Arm of mounting support 12 28 Arm of mounting support 12

29 Receptacle 30 Spring Arm

31 Spring arm 32 Spot contact area

α angle

Resulting spring force at the F _F receiver 29

F _R radial preload force

Axial component of F _X spring force (F _F )

1 and 2 show a first embodiment of the spot type disc brake 1 in two cross sections. The spot type disc brake 1 comprises a housing 2 composed of a first housing leg 6, a housing bridge 3, and a second housing leg 7 that is outside of the housing. In this embodiment, piston-and-cylinder units 4, 5 are provided on the first housing leg 6, and the back plate 8 of the brake shoe 21 comprising the brake lining 9 is a piston. (4) is fixed in contact with. The outer housing leg 7 is provided with another brake shoe 22 comprising a back plate 10 and a brake lining 11. The brake shoes 21, 22 act on the parts (not shown) of the brake disc. The housing 2 and the brake shoes 21, 22 and the back plates 8, 10 of the brake shoes are respectively mounted on the piston-and-cylinder units 4, on the two arms 27, 28 of the mounting support 12. It is mounted to slide parallel to the moving axis 13 of 5). The housing 2 comprising the piston side housing leg 6 is located on two pins 20, 25 screwed to the mounting support 12. The spring pulls the outer housing leg 7 onto the arms 27, 28 of the mounting support (see FIG. 3), so that the brake shoe 22 is fitted with the arms 27, 28 of the holder 12 and the housing. Supported between the bridges (3). Similarly, the brake shoe 21 including the back plate 8 is also slidably supported on the arms 27 and 28 of the mounting support 12. In order to prevent a rattling sound, the brake shoes 21 are supported by the holddown spring 14 between the arms 27 and 28 and the housing bridge 3. The spring 14 of this embodiment is fixed to the receiving portion 29 on the back plate 8 of the brake shoe 21, pressing the two contact surfaces 15, 16 with the two spring arms 30, 31. . As such, only the spot contact portions 17, 32 are configured between the spring arms 30, 31 and the contact surfaces 15, 16, minimizing the occurrence of erosion factors. The contact surfaces 15, 16 are inclined at an angle α with respect to the movement axis 13 of the piston-and-cylinder units 4, 5, the angle α being the movement axis 13 and the resulting It lies in the plane defined by the force vector of the spring force F _F. Thus, the radial preload force F _R acting perpendicularly to the arms 27, 28 of the mounting support 12 occurs as a result of the spring force F _F. In addition, an axial force component F _X acting on the piston 4 and the brake shoe 21 and parallel to the moving axis 13 is achieved. The mounting support 12 is provided directly to the wheel suspension or the spring rest of the vehicle, together with them to form a component.

An embodiment is also possible in which the housing bridge 3 is provided with only one contact surface or several contact surfaces. The holddown spring then comprises, in interaction with one or more contact surfaces, the axial force component of the spring force F _F parallel to the movement axis 13 of the piston-and-cylinder units 4, 5. F _X ) needs to be configured to produce. In the construction of one or more contact surfaces, it is very important that the contact surfaces are inclined at a predetermined angle α with respect to the moving axis 13, acting as axial sliding slope (s), the angle α being It lies in the plane formed by the force vector of the moving axis 13 and the resulting spring force F _F.

3 shows a perspective view of a spot type disc brake 1 according to another embodiment, wherein the contact surfaces 15, 16 are realized with add-on pieces 18, 19. Two brake shoes are not shown, except for the piston side back plate 8, in order to make the arrangement well visible. Thus, a housing 2 comprising a housing leg 6 is movably attached to the mounting support 12 by pins 20, 25, and the brake shoe is attached to the contact surface 15 of the housing bridge 3. It is evident between the support 16 and the arms 27, 28 of the mounting support 12. In FIG. 3 which shows the brake shoe 21 as a whole, only the back plate 8 which contacts the arms 27 and 28 is shown. Fixed to the receiving portion 29 of the back plate 8 supports the back plate 8 with respect to the contact surfaces 15, 16 or the extensions 18, 19 using two spring arms 30, 31. It is a spring (14), and the contact surface or the extension portion bears the back plate together with the arms (27, 28) of the mounting support (12), respectively. The extensions 18, 19 are screwed into the housing bridge by screws 23, 24. However, within the gist of the present invention, fixing methods such as embossing and frictional engagement, and molecular bonding, or any other linking, are also possible. In this case, it is only relevant that the contact surface is formed of a separate component which generates an axial force component F _X in interaction with the hold down spring 14.

The function of the spot type brake disc 1 is as follows. The brake shoes 21, 22 are arranged between the housing 2 and the mounting support 12, and in order to prevent rattling noises, the hold down spring 14 has a piston side with respect to the contact surfaces 15, 16. The brake shoe 21 is preloaded and the piston side brake shoe is pressed against the arms 27 and 28 of the mounting support part 12. Due to the angle α of the contact surfaces 15, 16, the axial force parallel to the moving axis 13 from the spring force F _F of the holddown spring 14 relative to the radial preload force F _R Component (F _X ) is induced. When the brake is applied, hydraulic pressure is generated in the piston-and-cylinders 4 and 5 to move the piston 4 out of the cylinder 5. Thereby, the brake shoe moves to the brake disc until the lining 9 of the brake shoe 21 contacts the brake disc. As a result, the piston-and-cylinder units 4 and 5 or the piston side housing legs 6 are each away from the brake disc, and through the housing bridge 3 the housing legs 7 on the opposite side in the brake disc side direction. Pulls. Therefore, the other brake shoe 22 is also pressed against the brake disc, and the two brake shoes 21 and 22 exert a vertical force on the contact surface portion of the brake disc. When the brake is released, pressure is no longer applied to the piston-and-cylinder units 4, 5, and the axial component F _X of the spring force F _F parallel to the movement axis 13 is equal to the piston. (4) and the brake shoe 21 are moved from the brake disc to its initial position. Thus, the brake shoe 21 will not slip on the brake disc after brake actuation, thus avoiding undesirable braking residual moment. Thus, the gap behavior of the brake is significantly improved.

Claims (9)

At least one housing having a housing (2) comprising a housing bridge (3), an actuating element (5) movable along the axis of movement (13) and an actuating unit (4, 5) comprising a component (4) One or more brake shoes 21, one or more contacts of the brake shoes 21 and the housing bridge 3, which are disposed on the legs 6, the components 4 and slidably supported on the one or more supports 27, 28. The spot type disc brake 1 comprising a hold down spring 14 which generates a preload force F _R between the surfaces 15, 16 and supports the brake shoes 21 together with the supports 27, 28. In Spot type disc brake, characterized in that the contact surfaces (15, 16) of the holddown spring (14) are arranged not parallel to the moving axis (13). The method of claim 1, The angle α between the contact surfaces 15, 16 and the moving axis 13 is greater than 0 °, the angle α being defined by the force vector of the moving axis 13 and the resulting spring force F _F. Spot type disc brakes, characterized in that lying on the plane to be formed. The method according to claim 1 or 2, Spot type disc brake, characterized in that the angle α is greater than approximately 1.5 °. The method according to any one of claims 1 to 3, Spot type disc brake, characterized in that the angle α is approximately 1.5 ° to 11 °. The method of claim 1, Spot type disc brake, characterized in that the one or more abutment surfaces (17, 32) between the hold down spring (14) and the contact surfaces (15, 16) of the housing bridge (3) have a spot-like shape. The method of claim 1, Spot type disc brake, characterized in that the contact surfaces (15, 16) and the housing bridge (13) are integrally constructed. The method of claim 1, Spot type disc brake, characterized in that the contact face (15, 16) and the housing bridge (13) consist of a plurality of parts, the contact face (15, 16) being provided with one or more extensions (18, 19). The method of claim 1, Spot type disc brake, characterized in that the holddown spring (14) consists of a wire spring or a leaf spring. The method of claim 1, Spot type disc brake, characterized in that the operating units (4, 5) are based primarily on hydraulic or electromechanical operating principles.

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